Type-bar rest.



E. G. LA TTA. TYPE BAR REST.

APPLICATION 'r'ILED OCT- 16. 1914-.

Patented Dec. 19,1916. 2 SHEETS-SHEET] Iva /P223 77 7771 asses:-

TYPE BAR REST. APPLICATION FILED OCT. 16. l9l4.

Patented Dec. 19, 1916.

2 SHEETS-SHEET 2' fl%7'7?6g-$ mew/QM.

77977? eases 3- in their normal rest position.

EMMIT G. LATTA, 0F SYRACUSE, NEW YORK.

TYPE-BAR REST.

neoaaac. I

Specification of Llattcrs Patent. I Patented Bras, 1%, 19116.

@rigiiial application filed February 15, 1911, Serial No. 608,657.Divided and this application filed October 16, 1914. Serial No. 866,936.

Be it known that I, EMMrr G. LA'r'rA, a citizen of the United States,residing at Syracuse, in the county of Onondaga and State of New York,have invented a new and useful Improvement-in Type-"Bar Rests, of

which the following is a specification.

This invention relates to improvements in rests or back stops which'areemployed in typewriting machines for arresting the movement of thetype-bars when returning from their excursions to the platen, and forsupporting the free ends of the type bars This application is a divisionof my application Serial No. 608,657, filed February 15, 1911, which hasmatured into Patent No. 1,115,077, dated October 27, 1914, and theinvention is herein described and illustrated in connection with a frontstrikeor visible writing typewriter of the construction disclosed insaid application, in which the typebars are pivotal y mounted on asegment that is adapted to be shifted for placing one or another of thedifierentsets of type on the type-bars in printing relation to theplaten. The invention is not, however, necessarily restrictedinapplicationto a typewriter of this construction.

The object of the invention is to provide a type-bar rest or back stopof simple and practical construction which will eifecprevent thetype-bars from reboundtually ing wh n theyreturn from the platen intoengagement with the rest or back stop, and

which will also reduce to the minimum the noise incident to the contactof the type-bar 1 v with the back stop. or rest.

In the accompanying drawmgsrFigure 1 is a fragmentary longitudinalsectional elevation of a typewriti'ng machine provided with a type-barrest or back stop embodying .the invention. Fig. 2 is a front"elevation,

art ly in section, thereof in line 22, Fig. 1. ig. 3 is a fragmentaryfront elevation of the back stop showing (exaggerated) the deformationthereof incident to the contact of a type-bar therewith. Fig. 4 is arear elevation of one'end of the segment showing the manner of attachingthe back stop thereto. r

A represents. the main frame of the machine; B the top plate thereof; Cthe platen carriage'which supports the platen c; E the type bars whichare pivoted in an are be- -middle of the segment.

low the carriage so that the type-bars can swing upwardly and rearwardlyto make the impressions at the front side of the platen; F the keylevers and f one of the auxiliary levers operated thereby for actuatingthe type-bars; and G the segment or support on whlch the type-bars arepivotally mounted. The segment is movably mounted so'that it can beshifted vertically on a central arm h and two side arms h h the frontends of rear side of the segment. The side arms h h are rigidly securedat their rear ends to a rock shaft H which is suitably journaled at itsends on the opposite sides of the main frame, and the central arm h isforked and has the rear ends of its two branches pivoted in lugs kprojecting upwardly from a bar k which is rigidly secured to the rearportion of the main frame and to which the rear ends of the key leversare pivoted. The segment-supporting arms are parallel and thus hold thesegment upright in its normal and shifted positions. 1 represents a camwhich are pivoted inslotted lugs 76 on the tel rock shaft 2' and isprovided with a cam slot in which works a roller 91' journaled on abracket 2' which is secured in any suitable way to and projectsforwardly from the w These parts are preferably constructed and operateas shown and described in said application hereinbefore mentioned, butthey could be of any a other suitable construction.

P represents the back stop, or'rest, for supporting the outer ends ofthe type-bars in the normal position thereof. This back stop is alsosupported from the segment so as to shift ,therewith, for instance, byposts {I which are rigidly secured to the ends of the segment in anyconvenient way and project forwardly therefrom. The back stop or rest,as shown in Fig. 1, preferably'consists of a chain composed of centerblocks and side links pivotally connected by rivets, and is providedwith a top strip or pad p of leather or other The suitablenoise-preventing material. blocks and links meet on radial lines withonly enough clearance to permit'a very limited movement thereof on therivets, so that the back stop or rest retains a segmental form and onlya limited flexing thereof is permitted. The end blocks are pivoted onthe front ends of the supporting-posts p.

. the chainat both sides of that point, and this transmits a slightimpulse to some of the adjacent type-bars so that their inertia is addedto that of the chain to absorb the shock. The result is that thetendency of the type-bars to rebound is practically overcome.

In the use of a type-bar rest or back stop composed of a chain of linksor connected blocks or weights as described, it has been found that whena type-bar returns from the platen intov contact with the back stop,sev- 'eral of the bars at each side of it move slightly toward theplaten, showing that the chain is slightly flexed outwardly at the pointstruck, and straightens somewhat at each side ofthe returning bar,asindicated in Fig. 3, and that part at least of the force of thereturning bar is transmitted to the adjacent bars which do not howeverofl'er' enough resistance to cause the returning bar to rebound. Thebars thus moved at opposite sides of the returning bar react on thechain to restore it. to its normal curve. The links of the back stopshould be sufliciently heavy not only to cause the inertia thereof toabsorb more or less of the force of the blow delivered by the returningtype-bar, but prevent appreciable rebound of the returning type-bar bythe reaction of the adjacent type-bars. The back stop or rest isflexible or adapted to'give under the blow of the returning type-bar butis practically free from rigidity and elasticity and its action isdifferent from that which would result from the use of an elastic devicesuch, for example, as a helical wire or spring. The back stop withproperly proportioned parts prevents practically entirely even theslightest noticeable rebound and therefore overcomes the trouble. causedby the rebounding of the type-bars. It also eliminates practically allnoise incident to the contact of the type-bars with the back stop.

The back stop or rest is preferably constructed of metallic links andfaced with a strip of nonresonant or sound-preventing.

material, as shown, but the back stop could be composed in whole or inpart of flexibly connected component blocks or links made of fibrous orother material having the minimum elasticity and of a non-resonant orsound deadening character without departing from the invention, and. theback stop could be of still other construction comprising a chain orseries of separate blocks, links or units flexibly connected to form acontinuous flexible and substantially inelastic rest for the type-bars.

It will be apparent that the back stop or rest described can be attachedto a nonshifting segment or otherwise mounted in the machine, and isalso applicable to ma chines ofdifferent construction from that shown inthe drawings.

I claim as my invention: 1. The combination with a series of movl abletype-bars, of a flexible backstop suspended from its ends and comprisinga plurality of separate rigid parts flexibly connected end to end toform a yielding substantially inelastic rest for the type-bars.

2. The combination with a series of movable type-bars, of a jointed,flexible, substantially inelastic back stop for the type-bars suspendedby its ends.

3. The combination with a series of movable type-bars, of a flexiblearticulated, substantially inelastic back stop for arresting thetype-bars as they return to normal position, said back stop beingconstructed and adapted to distribute some of the force of the returningbars to other bars of the series.

I 4. The combination with a series of movable type-bars, of anarticulated back stop of rigid component sections for arresting thetype-bars as they return to normal position having a surface ofnon-resonant character for contact with said type-bars.

5. The combination with a series of pivoted type-bars, and a supporting"segment therefor, of a curved, flexible articulated, substantiallyinelastic back stop for the typebars pivotally connected in fixedrelation to' the segment.

6. The combination witha series of movable type-bars, of an articulatedback stop for arresting the type-bars as they return to their normalposition, suspended from its ends, and a continuous strip'ofnoise-deadening material arranged on the back stop for the engagement ofthe type-bars.

7. The combination with a series of movable type-bars, of a back stopfor arresting the type-bars as they return from the platen comprising achain of pivotally connected links and having a yielding surface for theengagement of the type-bars.

8. A type-bar rest consisting of a flexible chain suspended by its endsand comprising a series of separate flexibly connected blocks.

9. A type-bar rest consisting of a flexible chain suspended by its endsand comprisinga series of separate pivotally connected blocks. I

10. 'A type-bar rest consisting of a flexible chain suspended by itsends and composed of a series of separate blocks flexibly connected "soas to have a limited movement relative to each other.

incense 11. The combination with a. series of pivoted type-bars, and. ashiftablesupporting segment therefor, of an articulated backstop for thetype-bars suspended by its ends from supports on said segment.

12. lihe combination with a series of pivoted type-bars, of a back-stopfor intercepting the type-bars as they return to their v normal positioncomprising a chain of pivotally connected rigid links.

13. The combination with a series of typebars, of a back-stop forintercepting the type-bars as they returnto their normal positioncomprising a chain of links pivotally ber, 1914:.

EJNHVHT G. LATE-A.

Witnesses:

ELMER E. STANTON, LEONARD '1. How.

